JPWO2018055676A1 - Battery pack and conductive member - Google Patents

Abstract

The assembled battery of the embodiment includes, for example, a plurality of battery cells, a connection member, a conductive member, and a heat transfer portion. Each of the plurality of battery cells had an electrode terminal portion. The conductive member extends across the plate-like first terminal portion connected to the connection member, the plate-like second terminal portion connected to the electrode terminal portion, and the first terminal portion and the second terminal portion. And a plate-like bridge portion fused by heat including self-generated heat. The heat transfer portion is provided at a first portion of the conductive member from the first terminal portion to the bridge portion, and the temperature of the first end portion of the bridge portion in the width direction of the bridge portion is the first end of the bridge portion Heat transfer is performed so as to be higher than the temperature of the second end opposite to the part.

Description

  Embodiments of the present invention relate to an assembled battery and a conductive member.

  Conventionally, a battery assembly is known which comprises a conductive member for connecting a plurality of batteries and a connecting member such as a connector for transferring electric power to and from an external device, and the conductive member is fused when an overcurrent flows. There is.

JP, 2013-196932, A

  However, in the prior art, for example, it is difficult to specify which of the two end portions in the width direction of the conductive member starts melting. Therefore, in this type of battery pack, it is preferable if a novel configuration capable of starting melting from a specific end of the conductive member is obtained.

  The assembled battery of the embodiment includes, for example, a plurality of battery cells, a connection member, a conductive member, and a heat transfer portion. Each of the plurality of battery cells had an electrode terminal portion. The conductive member includes a plate-shaped first terminal portion connected to the connection member, a plate-shaped second terminal portion connected to the electrode terminal portion, the first terminal portion and the second terminal portion. And a plate-like bridge portion which is provided across the terminal portion of the plate and which is melted and cut by heat including self-generated heat. The heat transfer portion is provided in a first portion of the conductive member from the first terminal portion to the bridge portion, and the temperature of the first end portion of the bridge portion in the width direction of the bridge portion is the same. Heat transfer is performed so as to be higher than the temperature of the second end opposite to the first end of the bridge portion.

FIG. 1 is a schematic and exemplary perspective view of the battery assembly of the first embodiment, showing the battery assembly installed in the installation portion. FIG. 2 is a schematic and exemplary exploded perspective view of the battery assembly and the fixing structure of the first embodiment. FIG. 3 is a schematic and exemplary perspective view of the battery pack of the first embodiment. FIG. 4 is a schematic and exemplary perspective view of the battery pack of the first embodiment, showing a state in which the lid member is removed. FIG. 5 is a schematic and exemplary plan view of the battery pack of the first embodiment, showing a state in which the lid member is removed. FIG. 6 is a schematic and exemplary side view of a part of the battery assembly of the first embodiment. FIG. 7 is a schematic and exemplary cross-sectional view of a part of the battery assembly of the first embodiment. FIG. 8 is a schematic and exemplary perspective view of a conductive member of the battery assembly of the first embodiment. FIG. 9 is a schematic and exemplary plan view of a conductive member of the battery assembly of the first embodiment. FIG. 10 is a schematic and exemplary plan view of a portion of the battery assembly of the first embodiment, showing a state in which the lid member is removed. FIG. 11 is a schematic and exemplary perspective view of the inside of the housing of the battery assembly of the first embodiment, in which a nut is supported by the support portion. FIG. 12 is a schematic and exemplary perspective view of the inside of the housing of the battery assembly of the first embodiment, in which the nut is removed from the support. FIG. 13 is a schematic and exemplary perspective view of a nut of the battery assembly of the first embodiment. FIG. 14 is a schematic and exemplary plan view of the conductive member of the battery assembly of the second embodiment. FIG. 15 is a schematic and exemplary perspective view of the conductive member of the battery assembly of the third embodiment. FIG. 16 is a schematic and exemplary front view of the conductive member of the battery assembly of the third embodiment. FIG. 17 is a schematic and exemplary perspective view of the inside of the housing of the assembled battery of the fourth embodiment, showing a state in which the cover member is removed. FIG. 18 is a schematic and exemplary plan view of the conductive member and the heat radiating portion of the assembled battery of the fourth embodiment. FIG. 19 is a schematic and exemplary cross-sectional view of the conductive member and the heat radiating portion of the assembled battery of the fourth embodiment. FIG. 20 is a schematic and exemplary perspective view of a portion of the assembled battery in the fifth embodiment, showing a state in which the lid member is removed. FIG. 21 is a schematic and exemplary perspective view of a conductive member of the battery assembly of the sixth embodiment. FIG. 22 is a schematic and exemplary perspective view of the conductive member of the battery assembly of the seventh embodiment. FIG. 23 is a schematic and exemplary perspective view of a portion of the assembled battery in the eighth embodiment, showing a state in which the lid member is removed.

  In the following, exemplary embodiments of the present invention are disclosed. The configurations of the embodiments shown below, and the operations and results (effects) provided by the configurations are examples.

  In addition, a plurality of embodiments disclosed below include similar components. Therefore, in the following, those similar components are given the same reference numerals, and overlapping descriptions are omitted. In the following drawings, directions are defined for the sake of convenience. The X direction is the longitudinal direction of the housing 11 and the width direction of the battery cell 12. The Y direction is along the short direction of the housing 11 and along the thickness direction of the battery cell 12. The Z direction is along the height direction of the housing 11 and the height direction of the battery cell 12. The X direction, the Y direction, and the Z direction are orthogonal to one another.

First Embodiment
As shown in FIGS. 1 and 2, the assembled battery 1 includes, for example, a housing 11, a plurality of battery cells 12, conductive members 13 and 14, connectors 15 A and 15 B, and a circuit board 17. There is. The battery cell 12, the conductive members 13 and 14, the connectors 15 </ b> A and 15 </ b> B, and the circuit board 17 are housed in the housing 11. The plurality of battery cells 12 are electrically connected to each other by the plurality of conductive members 13. The power of the plurality of battery cells 12, that is, the power of the assembled battery 1 can be output to the external connector 100 (connecting member) via the conductive member 14 and the connectors 15A and 15B. Further, the battery assembly 1 can be fixed to the installation portion 103 by the bracket 101 and the bolt 102. One of the connectors 15A and 15B is a positive electrode connector, and the other of the connectors 15A and 15B is a negative electrode connector. Hereinafter, the connector 15 may be used as a generic name of the connectors 15A and 15B. The battery assembly 1 may also be referred to as a battery module or a battery device. The housing 11 may also be referred to as a case or a container. The battery cell 12 may also be referred to as a single battery or a battery. The connector 15 is an example of a connection member and a connection target.

  The battery cell 12 is configured as, for example, a lithium ion secondary battery. The battery cell 12 may be another battery such as a nickel hydrogen battery, a nickel cadmium battery, or a lead storage battery.

  As shown in FIG. 2, the battery cell 12 is configured in a flat rectangular parallelepiped shape that is thin in one direction (for example, the Y direction). The battery cell 12 has a housing 21, a positive electrode terminal 22 A, a negative electrode terminal 22 B, and a valve 24. In the housing 21, an electrode body and an electrolyte (not shown) are accommodated. The electrode body may be formed, for example, by spirally winding a positive electrode sheet and a negative electrode sheet, which are power generation elements, through a separator. The electrode body may be formed, for example, by laminating a positive electrode sheet and a negative electrode sheet via a separator. The positive electrode terminal 22A and the negative electrode terminal 22B are connected to the positive electrode sheet and the negative electrode sheet of the electrode assembly, respectively. Hereinafter, the electrode terminal 22 may be used as a generic term for the positive electrode terminal 22A and the negative electrode terminal 22B. The electrode terminal unit 22 is an example of a connection target.

  The housing 21 is, for example, configured in a rectangular parallelepiped shape that is thin and flat in one direction (for example, the Y direction). The housing 21 is made of a metal material (for example, aluminum, aluminum alloy, stainless steel, etc.) or a synthetic resin material. The housing 21 is configured by combining a housing 21 a and a lid 21 b. The housing 21a is formed in a substantially rectangular box shape whose upper portion is opened, and the electrode 21 and the electrolytic solution are housed in the housing 21a. The lid 21 b closes the opened upper portion of the housing 21 a. The housing 21 may also be referred to as a container.

  The positive electrode terminal portion 22A and the negative electrode terminal portion 22B are provided on the lid 21b and protrude from the outer surface of the lid 21b. The positive electrode terminal 22A and the negative electrode terminal 22B are spaced in the X direction, that is, in the longitudinal direction of the lid 21b. The positive electrode terminal 22A and the negative electrode terminal 22B are each made of a conductive material.

  The valve portion 24 is provided between the positive electrode terminal portion 22A and the negative electrode terminal portion 22B in the lid 21b. The valve portion 24 is opened when the pressure in the housing 21 becomes higher than the threshold, and reduces the pressure in the housing 21.

  The plurality of battery cells 12 are arranged, for example, in three rows in the housing 11. The plurality of battery cells 12 are arranged such that the outer surface of the lid 21b faces the same direction (for example, the Z direction), and the longitudinal direction of the lid 21b is along the same direction (for example, the X direction) Is located in The plurality of battery cells 12 are electrically connected in series or in parallel by the plurality of conductive members 13. The conductive member 13 is made of, for example, a conductive material such as aluminum. The conductive member 13 may also be referred to as a bus bar, a connection member, or a coupling member.

  As shown in FIG. 3, the housing 11 has a rectangular parallelepiped appearance that is long in one direction (X direction). As shown in FIGS. 2 to 5, the housing 11 includes a bottom wall 11a, end walls 11b and 11c, side walls 11d and 11e, a top wall 11f, an intermediate wall 11g (see FIG. 2), and partitions. It has a plurality of walls (walls) such as the wall 11h (see FIG. 2). The end wall 11 b is an example of a first outer wall, and the bottom wall 11 a is an example of a second outer wall.

  The bottom wall portion 11 a is formed in a rectangular (for example, rectangular) plate shape. The bottom wall portion 11 a extends along the XY plane. The outer surface of the bottom wall portion 11a is configured to be flat.

  The end wall portions 11 b and 11 c are formed in a rectangular (for example, rectangular) plate shape, and are connected to the end portions in the longitudinal direction (X direction) of the bottom wall portion 11 a. Further, the end wall portions 11 b and 11 c extend along a direction (a direction orthogonal to an example, YZ plane) intersecting with the bottom wall portion 11 a. The end wall portions 11b and 11c are provided substantially in parallel with each other at an interval in the longitudinal direction (X direction) of the bottom wall portion 11a.

  The side wall portions 11 d and 11 e are formed in a rectangular (for example, rectangular) plate shape, and are connected to the end portion in the short direction (Y direction) of the bottom wall portion 11 a. Further, the side wall portions 11d and 11e extend along a direction (a direction orthogonal to an example, XZ plane) intersecting the bottom wall portion 11a. The side wall portions 11d and 11e are provided substantially in parallel with each other at an interval in the widthwise direction (Y direction) of the bottom wall portion 11a. The side wall portions 11d and 11e are connected to the adjacent end wall portions 11b and 11c.

  The top wall portion 11 f is formed in a rectangular (for example, rectangular) plate shape. The top wall 11f is connected to the end of the end walls 11b and 11c and the side walls 11d and 11e on the opposite side to the bottom wall 11a. The top wall portion 11 f is provided at an interval from the bottom wall portion 11 a in the thickness direction (Z direction) of the bottom wall portion 11 a. The top wall 11 f extends substantially in parallel with the bottom wall 11 a.

  The intermediate wall portion 11g is formed in a rectangular (for example, rectangular) plate shape. The intermediate wall 11g is located between the bottom wall 11a and the top wall 11f. The intermediate wall 11g extends substantially in parallel with the bottom wall 11a and the top wall 11f. The intermediate wall 11g is connected to the inner surfaces of the end walls 11b and 11c and the side walls 11d and 11e.

  The partition wall portion 11 h is formed in a rectangular (for example, rectangular) plate shape. The partition wall portion 11 h is located between the bottom wall portion 11 a and the middle wall portion 11 g and connected to the bottom wall portion 11 a. The partition wall portion 11 h is provided side by side with the end wall portions 11 b and 11 c. The partition wall portion 11h is provided substantially in parallel with the end wall portions 11b and 11c. Further, the plurality of partition wall portions 11 h are arranged side by side (in an example, in parallel) in a state in which the surfaces face each other. The distance between the partition wall portions 11h is substantially constant.

  Inside the housing 11, a storage chamber 11i (see FIG. 2) surrounded by a bottom wall 11a, end walls 11b and 11c, side walls 11d and 11e, and an intermediate wall 11g is provided. The storage chamber 11i is divided into a plurality of areas (chambers) by the partition wall 11h and the spacer 31, and one battery cell 12 is stored in each area.

  Further, on the end wall portion 11b of the housing 11, two projecting portions 11j are provided. The two protrusions 11 j are provided at the end of the end wall 11 b on the top wall 11 f side. The protrusion 11 j is provided across the end wall 11 b and the top wall 11 f. Each protrusion 11 j protrudes (projects) to the outside of the outer surface 11 ba of the end wall 11 b. The two protrusions 11 j are provided at intervals in the short direction (Y direction) of the housing 11. A connector 15 is disposed at each of these projecting portions 11 j. The protrusion 11 j may also be referred to as an overhang.

  The housing 11 is made of an insulating synthetic resin material (for example, modified PPE (polyphenylene ether), PFA (perfluoroalkoxyalkane, tetrafluoroethylene-perfluoroalkylvinylether copolymer), etc.) . Further, as a synthetic resin material of the housing 11, a thermoplastic resin can be used. For example, PE, an olefin resin such as PP, PMP, etc., PET, a polyester resin such as PBT, PEN, POM resin, PA6 And polyamide resins such as PA66 and PA12, crystalline resins such as PPS resins and LCP resins, and alloy resins thereof, or PS, PC, PC / ABS, ABS, AS, modified PPE, PES, PEI, PSF, etc. Non-crystalline resins and their alloy resins can be used.

  Moreover, as shown in FIG. 2 etc., the housing | casing 11 is comprised as a combination of several members, specifically, the container 41, the intermediate member 42, and the cover member 43. As shown in FIG. The intermediate member 42 is overlapped with one end of the container 41 and coupled with the container 41, and the lid member 43 is overlapped with one end of the intermediate member 42 and coupled with the intermediate member 42. The storage chamber 11i is surrounded by the storage body 41 and the intermediate member 42.

  The housing body 41 includes a bottom wall 11a, end walls 41b and 41c included in the end walls 11b and 11c, side walls 41d and 41e included in the side walls 11d and 11e, and a partition wall 11h. ,have. The housing 41 is provided with an opening 41f (recess, recess) surrounded by the bottom wall 11a, the end walls 41b and 41c, and the side walls 41d and 41e. The opening 41 f constitutes at least a part of the storage chamber 11 i.

  The intermediate member 42 includes at least the end wall portions 42b and 42c included in the end wall portions 11b and 11c, the side wall portions 42d and 42e included in the side wall portions 11d and 11e, the intermediate wall portion 11g, and the protrusion 11j. It has and. The intermediate member 42 covers the opening 41 f of the container 41. The middle wall portion 11g is connected to the middle portions of the end wall portions 42b and 42c and the side wall portions 42d and 42e in the thickness direction (Z direction, height direction of the housing 11) of the bottom wall portion 11a. .

  The lid member 43 includes the top wall 11 f and at least a part of the protrusion 11 j.

  The housing body 41 and the intermediate member 42 are mechanically coupled by the coupling portion 44, and the intermediate member 42 and the lid member 43 are mechanically coupled by the coupling portion 45. That is, the container 41 and the lid member 43 are coupled via the intermediate member 42. The coupling portion 44 has a plurality of claws provided on the end wall portions 42b and 42c and the side wall portions 42d and 42e of the intermediate member 42 hooked on the end wall portions 41b and 41c and the side wall portions 41d and 41e of the housing 41, The intermediate member 42 and the container 41 are coupled. Further, the coupling portion 45 couples the lid member 43 and the intermediate member 42 by the plurality of claws provided on the lid member 43 being hooked on the side wall portions 42 d and 42 e of the intermediate member 42.

  As described above, in the case 11 having the above-described configuration, the plurality of battery cells 12 are accommodated in the opening 41 f of the accommodation body 41 that constitutes a part of the accommodation chamber 11 i. Insulating spacers 31 are disposed between the adjacent battery cells 12. The spacer 31 separates two adjacent battery cells 12 from each other. The spacer 31 is, for example, a sheet formed of an insulating material. The spacer 31 may also be referred to as a partition wall (wall).

  Further, the positive electrode terminal 22A and the negative electrode terminal 22B of the battery cell 12 penetrate through the through holes (openings) provided in the intermediate wall 11g and project to the top wall 11f of the intermediate wall 11g. .

  In addition, a plurality of conductive members 13 and 14, connectors 15A and 15B, a circuit board 17, a plate member 18 and the like are accommodated in an accommodation chamber 11k (space) provided between the intermediate wall portion 11g and the top wall portion 11f. It is done. The conductive members 13 and 14 are welded to, for example, the electrode terminal 22 (positive electrode terminal 22A, negative electrode terminal 22B) of the battery cell 12. The connectors 15A and 15B are coupled to the intermediate member 42 by couplings 46 such as screws. Also, the circuit board 17 is coupled to the lid member 43 by a coupling tool 46 such as a screw.

  The circuit board 17 is, for example, a printed circuit board (PCB). A wiring pattern is provided on the circuit board 17 and a plurality of electronic components are mounted. The circuit board 17 is electrically connected to the conductive member 13 and the like, and can detect the temperature of the conductive member 13, the voltage of the battery cell 12, and the like. Further, two (plural) connectors 48 are mounted on the circuit board 17. The connector 48 is, for example, a LAN connector (communication connector). The connector 48 is exposed from the opening 42 b 1 provided in the end wall 42 b of the intermediate member 42. The connector 48 is disposed between the two protrusions 11j, that is, between the two connectors 15A and 15B. For example, a connector 32 (see FIG. 1) of a LAN cable is connected to the connector 48. For example, the control device receives the detection result of the circuit board 17 and controls the voltage of the battery cell 12 through the LAN cable.

  Next, the connector 15, the conductive member 14, and the protrusion 11j will be described in detail. Since the two conductive members 14, the two connectors 15, and the two protrusions 11j have the same configuration, respectively, the conductive members of one (side wall 11d side, front side in FIG. 2) will be described below. 14, the connector 15, and the protrusion 11j will be mainly described.

  As shown in FIGS. 6 and 7, the protrusion 11j has a bottom wall 11ja, an end wall 11jb, side walls 11jd and 11je, and a top wall 11jf. The bottom wall 11ja extends from the intermediate wall 11g. The side wall 11jd extends from the side wall 11d (side wall 42d). The side wall portion 11je is located on the side (side wall portion 11e side) opposite to the Y direction of the side wall portion 11jd, and is provided at an interval in the Y direction from the side wall portion 11jd. The top wall 11jf extends from the top wall 11f. The end wall 11jb is connected to the bottom wall 11ja, the side walls 11jd and 11je, and the top wall 11jf. In the other of the two projections 11j (side wall 11e side, back side in FIG. 2), the side wall 11je extends from the side wall 11e (side wall 42e), and the side wall 11jd is a side wall It is located in the Y direction (side wall 11d side) of 11je.

  Further, the protrusion 11 j has an end face 11 jj in the protrusion direction of the protrusion 11 j (as an example, the direction opposite to the X direction, the right direction in FIG. 7). The end face 11jj constitutes the outer surface of the end wall 11jb. Further, a chamber 11jh (space, storage chamber) is provided in the projecting portion 11j. The chamber 11jh opens at the end face 11jj. The chamber 11jh includes an opening 11ji penetrating the end wall 11jb (end face 11jj). Also, the chamber 11jh communicates with the storage chamber 11k.

  In the present embodiment, the connector 15 is a female connector, and the external connector 100 is a male connector. The connector 15 has an insulating body 15a and a conductive member 15b supported by the body 15a. The body 15a is provided with an opening 15c. The external connector 100 is inserted into the opening 15 c, and the connector 15 and the external connector 100 are fitted to each other. In the present embodiment, the insertion direction (attachment direction, attachment direction) of the external connector 100 to the connector 15 is the opposite direction (X direction) to the projection direction of the protrusion 11 j. That is, the external connector 100 is moved in the direction (X direction) opposite to the projecting direction of the protrusion 11 j and attached to the connector 15. The body 15a is made of a synthetic resin material. In FIG. 7, the internal structure of the connector 15 is schematically shown. Also, the connector 15 may be a male connector and the external connector 100 may be a female connector.

  The conductive member 15b is supported by the body 15a in a state where a part thereof is embedded in the body 15a. The conductive member 15b is electrically connected to a terminal portion provided in the body 15a. The terminal portion is electrically connected to the terminal portion of the external connector 100. The conductive member 15b also has a terminal 15d projecting from the body 15a on the opposite side of the opening 15c of the body 15a. The terminal portion 15d is formed in a flat plate shape. The terminal portion 15 d is electrically connected to the electrode terminal portion 22 through the conductive member 14. The conductive member 15 b is made of, for example, a conductive material such as aluminum. The conductive member 15b may also be referred to as a bus bar, a connection member, or a coupling member.

  The connector 15 is at least exposed to the chamber 11jh in a state where the opening 15c is exposed from the opening 11ji of the protrusion 11j and the body 15a and the terminal 15d are aligned in the thickness direction (X direction) of the end wall 11b. Some are housed. In the present embodiment, as an example, a part of the body 15a is accommodated in the chamber 11jh, and the other part of the body 15a and the terminal portion 15d are accommodated in the accommodation chamber 11k. The entire body 15a and the entire connector 15 may be accommodated in the chamber 11jh. In the body 15a, both side portions in the Y direction of the body 15a are coupled to at least one of the middle wall portion 11g and the bottom wall portion 11ja by a coupling 46. At this time, the body 15a is pressed against the protrusion 11l which protrudes from the middle wall portion 11g and the bottom wall portion 11ja toward the connector 15. That is, the body 15a is supported by the projection 11l.

  As shown in FIGS. 7 to 9, the conductive member 14 has two terminal portions 14a and 14b, a bridge portion 14c interposed between the terminal portions 14a and 14b, and a connection piece 14i. The terminal portion 14a is an example of a second terminal portion, and the terminal portion 14b is an example of a first terminal portion.

  The terminal portion 14 a is electrically connected to two electrode terminal portions 22 of the same pole. The terminal portion 14a is formed in a flat plate shape along the D1 direction (XY plane). The D1 direction is a direction along the X direction, which is the opposite direction of the X direction. The terminal portion 14a has two individual terminal portions 14aa, and the electrode terminal portion 22 is connected to each of the individual terminal portions 14aa. Each individual terminal portion 14aa is provided with a hole 14ab. With the terminal portion 14 a and the electrode terminal portion 22 overlapped, a portion around the hole 14 ab of the terminal portion 14 a is welded (bonded) to the electrode terminal portion 22. The connection piece 14i extends from the edge of the terminal portion 14a. The connection piece 14i is connected to the circuit board 17. The D1 direction is an example of a first direction. The individual terminal portion 14aa may also be referred to as a wall portion.

  The terminal portion 14 b is electrically connected to the connector 15. The terminal portion 14a and the terminal portion 14b are spaced apart in the Z direction. The terminal portion 14 b is formed in a flat plate shape along the D1 direction (XY plane). The terminal part 14b is comprised by one wall part 14ba. The terminal portion 14b (wall portion 14ba) has two surfaces 14bb and 14bc. At least a part of the surface 14bb is overlapped with the terminal 15d of the connector 15 to be in contact with the terminal 15d (see FIG. 7). A region 14be overlapping and in contact with the terminal portion 15d on the surface 14bb is a region that performs exchange of electricity with the connector 15. In FIGS. 8 and 9, a part of the end of the region 14be is indicated by an alternate long and short dash line. Further, the terminal portion 14b is provided with a hole 14bd penetrating the surfaces 14bb and 14bc. A male screw member 49 described later is inserted into the hole 14bd (see FIG. 7).

  The terminal portion 14a and the terminal portion 14b are offset from each other in the thickness direction (Z direction) of the terminal portions 14a and 14b. The thickness direction intersects with the D1 direction.

  The bridge portion 14c is provided across the terminal portion 14b and the terminal portion 14a. The bridge portion 14c is formed in a plate shape and can be elastically deformed. In addition, the bridge portion 14c is configured to be cuttable by heat including self-generated heat.

  As shown in FIGS. 8 and 9, the bridge portion 14c includes a pair of end portions 14ca and 14cb and a pair of surfaces 14cc and 14cd. The pair of end portions 14ca and 14cb are both end portions in the width direction of the bridge portion 14c, and extend in the length direction of the bridge portion 14c. That is, the end portions 14ca and 14cb extend between the terminal portion 14a and the terminal portion 14b. Further, the pair of surfaces 14cc and 14cd are provided across the both end portions 14ca and 14cb. The face 14cc is connected to the face 14bb, and the face 14cd is connected to the face 14bc.

  In addition, the bridge portion 14c has two (plurality) convex portions 14ce and 14cf, and is configured in a substantially S shape. The convex portions 14ce and 14cf are provided between the terminal portion 14a and the terminal portion 14b and arranged in the Z direction. The convex portion 14ce is connected to the terminal portion 14b. The convex portion 14ce is bent in a shape that is convex in the D1 direction with respect to the terminal portion 14b, and is configured in a substantially U shape (curved shape) opened in the opposite direction to the D1 direction. The convex portion 14cf is connected to the terminal portion 14a. The convex portion 14cf is interposed between the convex portion 14ce and the terminal portion 14a, and is bent in a shape convex in the direction (X direction) opposite to the D1 direction with respect to the terminal portion 14a. It is comprised in the substantially U shape (curved shape) open | released in the direction.

  Further, in the present embodiment, the top of the convex portion 14ce is a melting portion 14cg. The melting portion 14cg is provided across the end portion 14ca and the end portion 14cb and is melted and cut by heat including self-heated heat. The area of a cross section (hereinafter also referred to as a longitudinal cross section) along the width direction and thickness direction of the bridge portion 14c of the fusing portion 14cg is smaller than the area of the longitudinal cross section of the portion around the fusing portion 14cg. Such a difference in cross-sectional area is caused by the extension of the plate member when the plate member is bent to form the convex portion 14ce. In the present embodiment, the longitudinal cross section of the fusing portion 14cg and the longitudinal cross section of the top of the convex portion 14cf are smaller than the longitudinal cross sections of other portions of the bridge portion 14c. Since such a fused part 14cg has a relatively large electric resistance, it will self-heat and melt when an overcurrent flows. That is, the bridge portion 14c (fusion portion 14cg) functions as a fuse. The convex portion 14ce is an example of a first convex portion, and the convex portion 14cf is an example of a second convex portion. The fusing part 14cg may also be referred to as a small cross-section part, a high resistance part, a fusing planned part, or a fuseable part.

  Further, in the present embodiment, the bridge portion 14c and the terminal portion 14b are arranged to be shifted in the Y direction. As one example, the terminal portion 14b is positioned closer to the end portion 14ca of the end portion 14ca and the end portion 14cb of the bridge portion 14c. Thereby, the level | step differences 14f and 14g are formed in the connection part of the terminal part 14b and the bridge part 14c.

  In the bridge portion 14c, the convex portions 14ce and 14cf can function as elastic portions (spring portions). For example, when the connector 15 vibrates in the Z direction with the fixing point by the connector 46 as a fulcrum, the convex portions 14ce and 14cf elastically deform. As a result, stress concentration at the terminal portions 14a, 14b, 15d and the electrode terminal portion 22 is easily alleviated. In addition, it is easy to absorb the mounting tolerance of the conductive member 14. In addition, the shape of convex-shaped part 14ce, 14cf may be except U-shape (curved shape). For example, the shapes of the convex portions 14ce and 14cf may be substantially V-shaped or the like. The conductive member 14 is made of, for example, a conductive material such as aluminum. The conductive member 14 may also be referred to as a bus bar, a connection member, or a coupling member.

  As shown in FIG. 10, the conductive members 14A and 14B are plane symmetric with respect to a plane P1 passing through the center of the housing 11 in the Y direction and orthogonal to the Y direction. The conductive members 14A and 14B are disposed in a posture in which the respective end portions 14ca face the center of the housing 11 in the Y direction. A part of the circuit board 17 is disposed between the conductive members 14A and 14B. That is, the conductive member 14 is provided in a posture in which the end portion 14 ca faces the circuit board 17. The circuit board 17 is an example of an electrical component.

  Further, as shown in FIGS. 8 and 9, the conductive member 14 is provided with a heat transfer portion 60. The heat transfer unit 60 is configured to perform heat transfer such that the temperature of the end 14ca of the bridge portion 14c is higher than the temperature of the end 14cb opposite to the end 14ca.

  The heat transfer portion 60 has an asymmetric portion 14 e included in the first portion 14 d from the terminal portion 14 b to the bridge portion 14 c in the conductive member 14. The asymmetric portion 14e includes a terminal portion 14b. The asymmetric portion 14e is configured asymmetrically with respect to a plane P2 (see FIG. 9) which passes through the center of the fusing portion 14cg in the width direction (Y direction) of the bridge portion 14c and is orthogonal to the width direction of the bridge portion 14c.

  In the conductive member 14 configured as described above, for example, when an overcurrent flows from the connector 15 to the conductive member 14 due to a short circuit or the like outside the assembled battery 1, the fusing part 14cg is fused by heat including heat generated by self-heating. Do. At this time, the heat generated by the electrical resistance between the terminal portion 14 b and the terminal portion 15 d of the connector 15 is transmitted to the fusing portion 14 cg through the asymmetric portion 14 e of the heat transfer portion 60. Since the terminal portion 14b constituting the asymmetric portion 14e is positioned closer to the end 14ca of the end 14ca and the end 14cb of the bridge portion 14c, the temperature of the end 14ca of the bridge 14c is equal to the end The heat transfer is performed so as to be higher than the temperature of the opposite end 14cb of 14ca. As a result, in the melting portion 14cg, the end portion 14ca that has reached the predetermined temperature earlier than the end portion 14cb becomes the melting start position S1 (see FIGS. 8 and 9), and melting starts from the melting start position S1. That is, the fusing progress direction of the fusing part 14cg is a direction from the end 14ca to the end 14cb. At this time, the fumes generated by the melting flow in the D2 direction along the melting direction. The conductive member 14 is provided such that the end portion 14 ca faces the circuit board 17, so the fumes flow toward the side opposite to the circuit board 17, that is, toward the side wall portions 11 d and 11 e. Thus, the scattering of fumes onto the circuit board 17 is suppressed. At this time, the heat generated by the electrical resistance between the terminal portion 14a and the electrode terminal portion 22 of the battery cell 12 is smaller than the heat generated by the electrical resistance between the terminal portion 14b and the terminal portion 15d of the connector 15. . For this reason, in the present embodiment, among the fusing part 14cg and the top of the convex part 14cf, the fusing part 14cg that becomes higher in temperature closer to the terminal part 14b is fused.

  As shown in FIG. 7, the terminal portion 15 d of the connector 15 and the terminal portion 14 b of the conductive member 14 are coupled by a nut 47 and an externally threaded member 49. The nut 47 and the male screw member 49 are housed in the housing 11 (storage chamber 11k) and connected to each other. Specifically, the terminal portion 15 d of the connector 15, the terminal portion 14 b of the conductive member 14, and the washer 70 are sandwiched between the nut 47 and the male screw member 49 in the Z direction.

  As shown in FIGS. 11 and 13, the nut 47 has a cylindrical portion 47 a into which the male screw member 49 is inserted, and a flange portion 47 b. The cylindrical portion 47a is configured in an annular shape (for example, a cylindrical shape) around the central axis Ax. The central axis Ax is along the Z direction. A female screw portion 47c is provided on the inner side (inner peripheral portion) of the cylindrical portion 47a. The nut 47 can be made of, for example, a metal material such as brass or iron. In addition, the surface of the nut 47 may be plated with nickel or the like.

  The flange portion 47 b protrudes from the end in the Z direction of the cylindrical portion 47 a to the outer side in the radial direction of the cylindrical portion 47 a. The flange portion 47 b has a surface 47 d that constitutes an end surface of the nut 47 in the Z direction. The terminal portion 14b of the conductive member 14 and the terminal portion 15d of the conductive member 15b are superimposed on the surface 47d (see FIG. 7). The surface 47 d is an example of a first surface.

  In addition, the flange portion 47b is non-circular when viewed in the direction along the axial direction (Z direction) of the central axis Ax. That is, the outer peripheral surface 47e around the central axis Ax of the flange portion 47b has a plurality of portions having different distances from the central axis Ax in the direction orthogonal to the central axis Ax when viewed in the direction along the central axis Ax. . In the present embodiment, for example, the flange portion 47 b is configured in a hexagon (polygon) when viewed in the direction along the central axis Ax.

  The nut 47 is supported by the support portion 11ga so as to be movable in the axial direction (Z direction) of the central axis Ax. As shown in FIGS. 7, 11 and 12, the support portion 11 ga is provided on the middle wall portion 11 g of the housing 11. An opening 11gb (through hole) is provided in the support 11ga. A nut 47 is accommodated in the opening 11gb.

  The support portion 11ga has an end face 11gc in the protrusion direction of the support portion 11ga and surfaces 11gd, 11ge, and 11gf that constitute the inner surface of the support portion 11ga. An end including the surface 47 d of the nut 47 protrudes from the end surface 11 gc. The surfaces 11gd, 11ge, and 11gf face the opening 11gb. The surface 11gd is formed in a shape (cylindrical shape) along the outer peripheral surface of the cylindrical portion 47a of the nut 47 and surrounds the cylindrical portion 47a. The surface 11ge is configured in a shape (non-circular shape, as an example, a hexagon) along the outer peripheral surface 47e of the flange portion 47b of the nut 47 and surrounds the outer peripheral surface 47e. The face 11gf is provided between the face 11gd and the face 11ge and extends along the XY plane. The surface 11gf supports the flange portion 47b on one side (Z direction) in the axial direction of the central axis Ax. The surface 11ge is an example of a second surface.

  The support portion 11ga configured as described above supports the nut 47 movably in the axial direction (Z direction) of the central axis Ax. Further, the surface 11ge limits the rotation of the nut 47 around the central axis Ax in a state of being in contact with the outer peripheral surface 47e.

  Here, in the present embodiment, the support portion 11ga may be integrally formed with the intermediate member 42 by resin molding. For this reason, the surface 11gd is formed in a tapered shape so that the diameter (cylinder diameter) increases toward the end surface 11gc. That is, a draft is provided on the surface 11gd. On the other hand, the diameter of the surface 11ge is constant. With such a configuration, the shape defect of the support portion 11ga is suppressed, and the decrease in the contact area between the surface 11gd and the outer peripheral surface 47e of the flange portion 47b is suppressed.

  In the above configuration, as shown in FIG. 1, with the external connector 100 and the connector 15 connected, the cable 104 connected to the external connector 100 extends along the end wall 11b at the lower end of the end wall 11b. It extends toward the part 11s. That is, the cable 104 extends in a direction intersecting with the insertion direction (X direction) of the external connector 100 into the connector 15. A gap is provided between the cable 104 and the outer surface 11ba of the end wall 11b.

  Further, as shown in FIG. 1, the battery assembly 1 is fixed to the installation portion 103 by, for example, a bracket 101 and a bolt 102. The installation portion 103 is formed, for example, in a rectangular (square) plate shape extending along the bottom wall portion 11 a of the housing 11. The installation portion 103 may also be referred to as a support member, a heat dissipation member, a tray member, a shelf member, a slide member, or the like. The battery assembly 1, the bracket 101, and the installation unit 103 are an example of a battery unit. In the present embodiment, for example, a plurality of battery units may be arranged in the same posture in the Y direction. The installation unit 103 is an example of a second support member.

  The bracket 101 has, for example, a bottom wall portion 101 a and an upright wall portion 101 b. The bottom wall portion 101 a is formed in a rectangular plate shape extending along the installation portion 103. As also shown in FIG. 2, the bottom wall 101 a is provided with an opening 101 c through which the bolt 102 passes. The standing wall portion 101b is formed in a rectangular plate shape extending along the end wall portions 11b and 11c of the housing 11, and is connected to the end portion on the end wall portions 11b and 11c side of the bottom wall portion 101a. There is. The standing wall portion 101b is provided with an opening 101d through which the bolt 102 passes. The bracket 101 is formed in a substantially L shape in the Y-direction line of sight by the bottom wall portion 101 a and the upright wall portion 101 b connected to each other. The bracket 101 is an example of a first support member, and may be referred to as a mounting member, a fixing member, or the like.

  As shown in FIGS. 2 and 6, the end wall portions 11b and 11c of the housing 11 are provided with a plurality of nuts 51, respectively. The nut 51 is provided with a second screw portion 51c (see FIG. 3) connectable to the first screw portion 102a (see FIG. 2) of the bolt 102. The first screw portion 102 a is a male screw portion formed on the outer surface of the shaft portion of the bolt 102, and the second screw portion 51 c is a female screw portion formed on the inner surface of the cylinder portion 51 a of the nut 51. . The nut 51 is configured integrally with the housing 11 by insert molding, for example. The nut 51 is fixed to the end wall portions 11 b and 11 c in a state where at least the second screw portion 51 c is exposed to the outside of the housing 11. In the present embodiment, the housing 11 is supported (fixed) on the bracket 101 by connecting the bolts 102 to the nuts 51 with the upright wall portion 101b (see FIG. 1) interposed therebetween. The bracket 101 is fixed to the mounting portion 103 by connecting the bolt 102 to a nut which can be provided on the back side of the mounting portion 103 with the mounting portion 103 and the bottom wall portion 101a interposed therebetween. With such a configuration, the housing 11 (battery pack 1) is fixed to the installation portion 103 via the bracket 101. The bracket 101 and the bolt 102 are an example of a fixing structure. The bolt 102 for coupling the bottom wall portion 101a to the installation portion 103 may be a screw.

  Further, a sheet-like heat conduction member may be provided between the bottom wall portion 11 a of the housing 11 and the installation portion 103. The heat conductive member is made of, for example, a synthetic resin material or the like in which a heat conductive filler (metal material) is contained. In a state where the bracket 101 is attached to the housing 11, the lower surface of the bottom wall 11a and the lower surface of the bottom wall 101a are aligned along the same plane. In the present embodiment, for example, the bolt 102 and the nut 51 are coupled to each other in a state in which the two bottom wall portions 101a aligned in the X direction are pressed to the installation portion 103 side. The heat conducting member is compressed in the Z direction between them. As a result, the bottom wall portion 11a and the heat transfer member can be more closely attached to each other, and the heat transfer member and the installation portion 103 can be more easily attached to each other. Therefore, for example, the heat of the plurality of battery cells 12 housed in the housing 11 can be effectively transmitted to the installation portion 103 through the bottom wall portion 11 a and the heat conduction member. In addition, a heat conduction member is not limited to a heat conduction sheet, For example, grease, an adhesive agent, etc. may be sufficient.

  As described above, in the present embodiment, for example, the heat transfer portion 60 is the first portion 14 d (first portion) from the terminal portion 14 b (first terminal portion) to the bridge portion 14 c in the conductive member 14. Provided in). Then, the heat transfer unit 60 transfers heat so that the temperature of the end 14ca of the bridge portion 14c becomes higher than the temperature of the end 14cb. Therefore, the melting portion 14cg of the conductive member 14 starts melting at an end portion 14ca (a melting start position S1) which has reached a predetermined temperature earlier than the end portion 14cb. Thus, according to the present embodiment, melting can be started from a specific location (end portion 14ca).

  Further, in the present embodiment, for example, the conductive member 14 includes the fusing portion 14cg provided over the terminal portion 14b and the terminal portion 14a and fused by heat including heat generated by self-heating. The heat transfer portion 60 is included in the first portion 14d, and has an asymmetric portion 14e having an asymmetric shape with respect to the plane P2. Therefore, according to the present embodiment, heat transfer is performed by the shape of the conductive member 14 so that the temperature of the end 14ca of the bridge portion 14c becomes higher than the temperature of the end 14cb. Therefore, since it is not necessary to provide the heat-transfer part 60 with a member different from the electrically-conductive member 14, the structure of the heat-transfer part 60 is easy to be simplified.

  Further, in the present embodiment, for example, the terminal portion 14b is positioned closer to the end portion 14ca of the end portion 14ca and the end portion 14cb. Therefore, according to the present embodiment, since the shape of the bridge portion 14c does not have to be asymmetrical with respect to the plane P2, the shape of the bridge portion 14c can be easily simplified.

  Further, in the present embodiment, for example, the connector 15 (first connector) is provided in the protrusion 11 j. Therefore, according to the present embodiment, for example, the position of the connector 15 can be easily understood. Also, for example, the operation of connecting the external connector 100 (second connector) to the connector 15 is easy. Also, for example, contact of the cable 104 connected to the external connector 100 with the outer surface 11 ba of the end wall 11 b is easily suppressed. Also, for example, the degree of freedom in the arrangement of the cables 104 can be easily improved.

  Further, in the present embodiment, for example, the support portion 11 ga movably supports the nut 47 in the axial direction of the central axis Ax of the nut 47 (first nut). Therefore, according to the present embodiment, even if a load acts on the conductive member 14 due to vibration or the like at the time of assembly of the battery assembly 1 or when the battery assembly 1 is mounted on a movable body such as a vehicle, the conductive member Since 14 and 15b can move, stress concentration in the terminal portions 14a, 14b and 15d of the conductive members 14 and 15b can be easily alleviated. In addition, even if there is variation in the arrangement of the connector 15 and the battery cell 12, the variation is easily absorbed by the movement of the nut 47.

Other Embodiments
Next, second to eighth embodiments shown in FIGS. 14 to 23 will be described. The assembled batteries of the second to eighth embodiments have the same configuration as the assembled battery 1 of the first embodiment. Therefore, the same result (effect) based on the same configuration as that of the first embodiment can be obtained also in the present embodiment. In the following, configurations different from those of the first embodiment are mainly described in the battery packs of the second to eighth embodiments.

Second Embodiment
In the conductive member 14 of the present embodiment shown in FIG. 14, the area 14be for transferring electricity between the terminal 14b and the connector 15 is closer to the end 14ca of the end 14ca and the end 14cb. . In FIG. 14, a part of the end of the region 14be is indicated by an alternate long and short dash line separated from the plane P2. The region 14be is included in the heat transfer unit 60. In such a configuration, the heat generated in the region 14be by current conduction is more transmitted to the end 14ca of the end 14ca and the end 14cb, and melting is started from the end 14ca.

Third Embodiment
In the conductive member 14 of the present embodiment shown in FIGS. 15 and 16, the end 14ca of the bridge portion 14c of the terminal portion 14b is provided with a recess 14ch. The recess 14ch is recessed in the width direction of the bridge portion 14c. The asymmetric portion 14e includes a terminal portion 14b and a second portion 14h between the terminal portion 14b and the recess 14ch in the bridge portion 14c. In such a configuration, the heat generated in the region 14be by current conduction is more transmitted to the end 14ca of the end 14ca and the end 14cb, and melting is started from the end 14ca.

Fourth Embodiment
The bridge portion 14c of the conductive member 14 of the present embodiment shown in FIGS. 17 to 19 has two curved portions 14ci and 14cj and a wall portion 14ck. The bending portion 14ci is connected to the terminal portion 14a. The bending portion 14cj is connected to the terminal portion 14b. The wall portion 14 ck intervenes between the two curved portions 14 ci and 14 c j. The wall portion 14 ck is configured in a flat plate shape. Further, in the present embodiment, the fusing part 14cg is configured by the curved part 14cj. In other words, the fusing part 14cg includes the curved part 14cj.

  The heat transfer unit 60 also has a heat release unit 61. The heat radiating portion 61 is made of a thermoplastic synthetic resin material or the like. The heat dissipation portion 61 may be a thermally flexible elastomer. The heat radiating portion 61 is provided between the first portion 14 d of the bridge portion 14 c and the housing 11 and is connected to the housing 11. In FIG. 18, for the sake of understanding, hatching is given to the heat radiation portion 61 hidden by the bridge portion 14 c. The heat radiating portion 61 is positioned closer to the end 14cb of the end 14ca and the end 14cb of the bridge portion 14c. In such a configuration, the heat generated in the conductive member 14 by the conduction is transmitted to the heat radiating portion 61 through the housing 11. When the heat transmitted to the heat radiating portion 61 increases due to the overcurrent, and the heat radiating portion 61 melts, the heat radiating portion 61 is exposed to the end 14cb of the end 14ca and the end 14cb of the bridge portion 14c (the first portion 14d). I touch the part that I got close to. Thus, the heat of the portion on the end portion 14cb side of the bridge portion 14c is dissipated to the casing 11 by the heat dissipation portion 61, and the temperature of the portion is lowered. That is, of the temperature of the end 14ca and the temperature of the end 14cb, the temperature of the end 14ca is relatively high. Therefore, melting is started from the end 14ca of the melting portion 14cg. The heat radiating portion 61 may be connected to the bridge portion 14 c before melting, and the heat radiating portion 61 is an example of a first heat radiating portion.

Fifth Embodiment
The conductive member 14 of this embodiment shown in FIG. 20 is the same as that of the fourth embodiment. In addition, the heat transfer unit 60 includes heat radiation units 61 and 62. The heat dissipation unit 61 has the same configuration as that of the fourth embodiment. The heat dissipation unit 62 is configured by an adhesive tape. The heat radiating portion 62 is provided across the first portion 14 d (first portion) of the bridge portion 14 c and the housing 11, and is connected to the first portion 14 d of the bridge portion 14 c and the housing 11. Yes (bonded). The heat radiating portion 62 is positioned closer to the end 14cb of the end 14ca and the end 14cb of the bridge portion 14c. In such a configuration, a large amount of heat generated in the region 14be by energization is transmitted to the end 14ca of the end 14ca and the end 14cb. Therefore, melting is started from the end 14ca of the melting portion 14cg. The heat radiating portion 62 is an example of a second heat radiating portion.

Sixth Embodiment
In the conductive member 14 of the present embodiment shown in FIG. 21, the terminal portion 14 b has a wall portion 14 ba and a protruding portion 14 bg. The protrusion 14bg protrudes from the wall 14ba. In the present embodiment, the end surface 14 bg 1 of the protrusion 14 b g is connected to the terminal 15 d of the connector 15. That is, in the present embodiment, substantially the entire area of the end face 14bg1 is an area 14be that performs exchange of electricity with the connector 15. The protruding portion 14bg and the terminal portion 15d are joined by, for example, welding or ultrasonic bonding. The protruding portion 14bg (terminal portion 14b) is formed asymmetrically with respect to the plane P2. The protrusion 14bg is closer to the end 14ca of the end 14ca and the end 14cb. And the asymmetrical part 14e contains the protrusion part 14bg (terminal part 14b). In such a configuration, a large amount of heat generated in the region 14be by energization is transmitted to the end 14ca of the end 14ca and the end 14cb. Therefore, melting is started from the end 14ca of the melting portion 14cg.

Seventh Embodiment
The bridge portion 14c of the conductive member 14 of the present embodiment shown in FIG. 22 has two curved portions 14ci and 14cj and a wall portion 14ck, as in the fourth embodiment. Moreover, the terminal part 14b of the electrically-conductive member 14 of this embodiment has wall part 14ba and protrusion part 14bg similarly to 5th Embodiment. However, in the present embodiment, the wall portion 14 ba is formed in a symmetrical shape with respect to the plane P 2, and the projecting portion 14 bg is formed in a polygon having an asymmetrical shape with respect to the plane P 2. The protrusion 14bg is closer to the end 14ca of the end 14ca and the end 14cb. And the asymmetrical part 14e contains the protrusion part 14bg (terminal part 14b). In such a configuration, a large amount of heat generated in the region 14be by energization is transmitted to the end 14ca of the end 14ca and the end 14cb. Therefore, melting is started from the end 14ca of the melting portion 14cg.

Eighth Embodiment
In the present embodiment shown in FIG. 23, a terminal block 80 is provided instead of the connector 15 of the first embodiment. The terminal block 80 is connected to the conductive member 14 and to an external connection member (not shown).

  In addition, you may combine the two or more elements of said each embodiment in the technically possible range.

  As mentioned above, although the embodiment of the present invention was illustrated, the above-mentioned embodiment is an example to the last, and limiting the scope of the invention is not intended. The above embodiment can be implemented in other various forms, and various omissions, replacements, combinations, and changes can be made without departing from the scope of the invention. The above embodiments are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by other than the configuration disclosed in the above embodiment, and can obtain various effects (including derivative effects) obtained by the basic configuration (technical features). is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, placement, position, material, etc.) should be appropriately changed and implemented. Can.

Claims (11)

A plurality of battery cells each having an electrode terminal portion;
A connecting member,
A plate-like first terminal portion connected to the connecting member, a plate-like second terminal portion connected to the electrode terminal portion, and the first terminal portion and the second terminal portion A conductive member having a plate-like bridge portion provided on a plate-like portion and fused by heat including self-generated heat;
The conductive member is provided in a first portion from the first terminal portion to the bridge portion, and a temperature of a first end portion of the bridge portion in the width direction of the bridge portion is the first temperature of the bridge portion A heat transfer portion for transferring heat so as to be higher than the temperature of the second end opposite to the end of the
, With a battery pack. The conductive member has a fusing part provided across the first end and the second end and fused by heat including self-generated heat;
The heat transfer portion is included in a first portion of the conductive member from the first terminal portion to the bridge portion, and a plane passing through the center of the fusing portion in the width direction and orthogonal to the width direction The assembled battery according to claim 1, comprising an asymmetric portion having an asymmetric shape. The first terminal portion is positioned closer to the first end of the first end and the second end,
The assembled battery according to claim 2, wherein the asymmetric portion includes the first terminal portion. The first end is provided with a recess,
The assembled battery according to claim 2, wherein the asymmetric portion includes the first terminal portion and a second portion between the first terminal portion and the recess in the bridge portion. . The first terminal portion has a wall portion, and a protruding portion which protrudes from the wall portion, is connected to the connection member, and is asymmetrical with respect to the plane.
The assembled battery according to any one of claims 2 to 4, wherein the asymmetric portion includes the first terminal portion. An area for exchanging electricity with the connection member of the first terminal portion is closer to the first end of the first end and the second end,
The assembled battery according to any one of claims 1 to 5, wherein the heat transfer portion includes the region. Equipped with a housing
The battery assembly according to any one of claims 1 to 6, wherein the heat transfer portion has a heat dissipation portion that releases heat of the conductive member in a state of being connected to the conductive member.   The assembled battery according to claim 7, wherein the heat transfer section has a thermoplastic first heat dissipation section.   The assembled battery according to claim 7, wherein the heat transfer portion has a second heat dissipation portion configured by an adhesive tape. Equipped with electrical components,
The assembled battery according to any one of claims 1 to 9, wherein the conductive member is provided in a posture in which the first end faces the electric component. A plate-like first terminal connected to the connecting member;
A plate-like second terminal connected to the electrode terminal of the battery cell;
A plate-like bridge portion provided across the first terminal portion and the second terminal portion and fused by heat including self-generated heat;
The first end portion of the bridge portion is provided at a first portion from the first terminal portion to the bridge portion, and the temperature of the first end portion of the bridge portion in the width direction of the bridge portion is the temperature of the first end portion of the bridge portion A heat transfer portion that transfers heat to be higher than the temperature of the opposite second end;
Conductive member.